• Option A, four pictures of a lumpy round nodule hollow like a geode, white base with round brown-gray protrusions.
  • A bunch of white and brown-gray chalcedony nodules spread on a lava sand background.
  • UV light symbol with message "Chalcedony nodules from Morocco have strong orange-to-white fluorescence under 365nm UV light. They can also have brief phosphorescence under the same wavelength." Underneath there are two chalcedony nodules fluorescing, one labeled G white with light blue, the other labeled A orange with white. Below it says "fluorescence under 365 nm UV"
  • Option B, four pictures of a long nodule, a white spherical formation at on one end has a brown tint like a toasted marshmallow. There are small round brown lumps with white overlay along the bottom like feet.
  • Option C, four pictures of a round nodule hollow in the center with a thin hole alone one side that looks like a mouth. The other side has well-formed swirls and round bumps.
  • Option D, four pictures of a flat clam-shaped nodule that is hollow in the middle. The piece curls around in a spiral around the center hole. White base with a lot of large round brown bumbs
  • Option E, four pictures of an irregular nodule that is all brown-gray in color with a shinier luster than normal. Bulbous round protrusions cover it
  • Option F, four pictures of an off-round white nodule with several round brown protrusions, with a white dusty overlay on one side
  • Option G, four pictures of a larger round white nodule hollow at the center like a geode, with the other side brown with bulbous texture and round growth
  • Option H, four pictures of a spherical nodule, white on one side fading to brownish-gray on the other side.
  • Option I, four pictures of a larger white chalcedony nodule with swirling growth around blobby round brown formations. The piece looks like it is melting in places with the growth forms stretched out. The back side is all white and has formed a druzy
  • Option J, four pictures of a drumstick-shaped nodule that is flat and curled up at the sides. It is white in the center and lumpy brown on the other side.
  • Option J, four pictures of an egg-shaped nodule that is slightly open like a geode in the front. It has two parallel slit openings like eyes, and a lumpy "nose." The piece is white with brown lumpy growth
  • Option L, four pictures of an irregular lumpy nodule with round protrusions. The piece has one broken end.
  • Scale images of options A–F on a measuring mat. Measurements are in the full description.
  • Scale images of options G–L on a measuring mat. Measurements are in the full description.
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Chalcedony nodules

Chalcedony nodules

$6.00 USD
$6.00 USD
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Locale: Morocco

Approx size:  1.5–3"

Approx weight: 100g avg (55–135g; some hollow like geodes)

 

Sometimes called “truffle,” “womb stone,” or “witches wart” chalcedony (hey, you don’t even want to know what I was calling them), these nodules have slightly obscene-looking bulbous, knobby forms in contrasting white and dark brown-gray semi-translucent chalcedony. The nodules are actually believed to be a fossil pseudomorph of prehistoric sponge colonies dating back to the Upper Cretaceous period. These minerals have only been found in Western Sahara, Morocco.

Chalcedony is essentially the cryptocrystalline version of quartz; it has the same chemical composition (silica) but different crystal structure (cryptocrystalline vs. crystalline). Some of the nodules are hollow and crystal-lined inside similar to a dull geode, and can make for interesting pieces to cut open.

L has the ugly duckling discount for reasons that are apparent!

UV reactivity These nodules are UV reactive, with a strong orange glow under 365nm UV light. The material can also briefly phosphoresce (try it in the dark, with a strong UV light!).

 

Our background model is Parodia marinana.

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